Effects of enhanced UV-B radiation on δ¹³C values and physiological feature in tobacco leaves

In order to study effects of enhanced UV-B radiation on δ¹³C values and physical feature in tobacco leave. Flue-cured tobacco variety K326 be used for increased UV-B radiation experiment materials in the field. To make measure δ¹³C value, soluble protein, chlorophyll and flavonoids, malondialdehyde conten for 13, 16 leaf positions. The result show that: Enhanced UV-B radiation on tobacco leaves has an important influence of the δ¹³C value, soluble protein, chlorophyll and flavonoids, malondialdehyde content in different growth periods. That UV-B radiation degree of impact on the physical characteristics of flue-cured tobacco and the damage degree 16 level position higher than 13. The dry matter accumulation 16 level position higher than 13 of tobacco leaves. The tobacco has sensitivity to UV-B radiation about the δ¹³C values are more sensitive to T1 treatment in 13 and 16 level positions. Correlation analysis showed that: The δ¹³C with protein, and flavonoids, malondialdehyde, chlorophyll and carotenoid were positively correlated. It shows that δ¹³C values are able to associate with tobacco physiology and quality characteristics in a certain extent. This paper makes for the research of flue-cured tobacco physiological ecology and provide theoretical basis for the forming quality. (authors)